References of "Jijakli, Haissam"
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See detailPotential for the use of lactoperoxidase against post-harvest diseases on fruit
Bafort, Françoise ULiege; Perraudin, Jean-Paul; Jijakli, Haissam ULiege

in Acta Horticulturae (in press)

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See detailEssentielles, les huiles?
Jijakli, Haissam ULiege

Article for general public (2019)

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See detailRosmarinus officinalis essential oil as an effective antifungal and herbicidal agent
Ben Kaab, Sofiène ULiege; Bettaieb Rebey, Iness ULiege; Hanafi, Marwa ULiege et al

in Spanish Journal of Agricultural Research (2019)

In order to reduce the use of chemical pesticides, great interest has been focused on environment-friendly biological control agents and botanicals that preserve biodiversity. In this context, our study ... [more ▼]

In order to reduce the use of chemical pesticides, great interest has been focused on environment-friendly biological control agents and botanicals that preserve biodiversity. In this context, our study aimed to assess the antifungal and herbicidal activities of Rosmarinus officinalis essential oil (EO) to find an alternative to synthetic pesticides. The chemical composition of R. officinalis essential oil was determined by gaz chromatography-mass spectrometry analysis (GC-MS). Results showed that R. officinallis EO was rich in monoterpenes and the major constituents were 1,8-cineole (54.6%), camphor (12.27%) and α-pinene (7.09%). However, under laboratory condition, two tests were carried out. The first one consisted on the study of EO antifungal activity using ELISA microplates and the second one consisted on evaluating the effect of EO on seedling growth of weeds. It was confirmed that this EO significantly inhibits spore germination of Fusarium oxysporum, Fusarium culmorum, Penicillium italicum and at 6 mM, the percentage of inhibition reached 100% on Fusarium oxysporum. Indeed, EO slows down seedling growth of Trifolium incarnatum, Silybum marianum, and Phalaris minor. In fact, EO at 5 mM completely inhibits seed germination. On the other hand, another experiment was carried out to evaluate the herbicidal activity by spraying EO on weeds. This showed that a novel herbicide formulation was set up for the first time to improve the activity of R. officinalis EO on post-emergence. Overall, R. officinalis EO can be suggested as a potential eco-friendly pesticide and suitable source of natural compounds potentially usable as natural pesticides. [less ▲]

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See detailDevelopment of a generic aquaponic model using object oriented programming to study the systems at the individuals level
Stalport, Benoît ULiege; Raulier, Pierre ULiege; De Cock, Nicolas ULiege et al

Poster (2019, February 04)

Aquaponics is the association of fish and plant farming, exploiting the natural phenomenon observed in aquatic ecosystems. The microbiota transforms the fish waste into different chemical forms that are ... [more ▼]

Aquaponics is the association of fish and plant farming, exploiting the natural phenomenon observed in aquatic ecosystems. The microbiota transforms the fish waste into different chemical forms that are less toxic for fish and very suited for hydroponic plants culture. Due to its recent and quick development, aquaponics can now be found in a variety of areas of interest such as personal installations, education fields, private and public research projects and reached nowadays the food production at medium and large scales industries. The diversity found in these installations makes it difficult to identify the mechanisms that rule aquaponics and to generalize the findings to other systems. Few researches established the equations that govern the behaviour of one particular system, in order to estimate the productions and to apply sensitivity analysis. These models often satisfy the goals of the developers but cannot be applied to different system setups. In this context, a generalist model is being developed for aquaponics. The equations are based on aquaculture, hydroponics and aquaponics researches and are implemented using an object-oriented programming in order to generate a completely generic model. The European Smart Aquaponics Project provides numerous systems with different architectures. All these installations are equipped with a full set of aquaponics sensors to generate a strong aquaponic database that will be used for model development. The computed outputs are various and new ones are regularly added to keep pace with the continuous development of aquaponics. In this case study, the model has been applied to an experimental setup to illustrate the basic calculated parameters such as the dynamical behaviours of the water volumes and several nutrient concentrations, the vegetal and animal biomasses, the water consumption, a few economic criteria, etc. [less ▲]

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See detailPS07-03: Greenhouses on rooftop to reduce CO2 in urban environment - the GROOF project
Sabre, Maeva; Schreier, Franz; Volk, David et al

Poster (2019)

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See detailEvaluation of lambda Carrageenan, CpG-ODN, glycine Betaine, Spirulina platensis, and Ergosterol as elicitors for control of Zymoseptoria tritici in wheat
Le Mire, Géraldine; Siah, Ali; Marolleau, Brice et al

in Phytopathology (2019), 109(3), 409-417

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See detailInsights gained from metagenomic shotgun sequencing of apple fruit epiphytic microbiota
Angeli, Dario; Sare, Abdoul Razack ULiege; Jijakli, Haissam ULiege et al

in Postharvest Biology and Technology (2019), 153

The epiphytic plant microbial communities living at the surface of fruit have been the source of most current biocontrol agents (BCAs) and can influence fruit quality during storage. Despite this interest ... [more ▼]

The epiphytic plant microbial communities living at the surface of fruit have been the source of most current biocontrol agents (BCAs) and can influence fruit quality during storage. Despite this interest, their taxonomical and functional composition has been poorly studied so far. This paper describes the use of high-throughput sequencing (HTS) technologies to characterise the microbial phytobiome residing on apple surface at the taxonomic and functional levels through shotgun metagenome sequencing. Apples from the Pinova cultivar bearing no symptom of disease development were sampled in an orchard at harvest, and their epiphytic microbiota was isolated. After DNA extraction, 14.1 Gbases of raw sequences were generated by HTS. These sequences were annotated following two pipelines in parallel: (i) they were individually analysed by the MG-RAST server, and (ii) they were de novo assembled into contigs and the contigs were annotated by the IMG server. Our results showed a very high fungal and bacterial diversity, with a higher proportion of fungal sequences (79.0%) than bacterial sequences (13.8%). Among fungi, the phylum Ascomycota prevailed, while Bacteroides were dominant in the bacterial population. Among them, 24 species corresponded to known apple pathogens like Aspergillus spp., Botrytis spp., Sclerotinia spp., and Penicillium spp. for fungi, and Erwinia spp. and Agrobacterium spp. for bacteria. Moreover, several contigs were assigned to species of known BCA strains belonging to the following genera: Filobasidiella spp., Talaromyces spp, Candida spp., Saccharomyces spp., Bacillus spp., and Enterobacter spp. The functional analysis showed similar patterns of abundance and function in all samples, identified genes potentially involved in biocontrol properties, but also underlined the complexity of datum interpretation and the incompleteness of current databases. [less ▲]

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See detailEndophytic fungal volatile compounds as solution for sustainable agriculture
Kaddes, Amine ULiege; Fauconnier, Marie-Laure ULiege; Sassi, Khaled et al

in Molecules (2019), 24

Endophytic fungi produce various mixtures of carbon-based compounds, which are known as volatile organic compounds (VOCs). Research regarding the use of VOCs as pesticide substitutes has garnered much ... [more ▼]

Endophytic fungi produce various mixtures of carbon-based compounds, which are known as volatile organic compounds (VOCs). Research regarding the use of VOCs as pesticide substitutes has garnered much attention. This review summarizes the recent knowledge about VOCs regarding their origin and chemical properties and emphasizes their antimicrobial potential against a wide variety of agricultural pathogens. Several studies have highlighted the importance of VOCs as antimicrobial agents. Nevertheless, the application of VOCs in biofumigation methods still requires the advanced evaluation of their phytotoxicity. [less ▲]

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See detailLinoleic and linolenic acid hydroperoxides interact differentially with biomimetic plant membranes in a lipid specific manner
Deleu, Magali ULiege; Deboever, Estelle ULiege; Nasir, Mehmet Nail et al

in Colloids and Surfaces B: Biointerfaces (2019), 175

Linoleic and linolenic acid hydroperoxides (HPOs) constitute key intermediate oxylipins playing an important role as signaling molecules during plant defense processes in response to biotic or abiotic ... [more ▼]

Linoleic and linolenic acid hydroperoxides (HPOs) constitute key intermediate oxylipins playing an important role as signaling molecules during plant defense processes in response to biotic or abiotic stress. They have also been demonstrated in vitro as antimicrobial agents against plant fungi and bacteria. To reach the phytopathogens in vivo, the HPOs biosynthesized in the plant cells must cross the plant plasma membrane (PPM) where they can also interact with plasma membrane lipids and have an effect on their organization.In the present study, we have investigated the interaction properties of HPOs with PPM at a molecular level using biophysical tools combining in vitro and in silico approaches and using plant biomimetic lipid systems. Our results have shown that HPOs are able to interact with PPM lipids and perturb their lateral organization. Glucosylceramide (GluCer) is a privileged partner, sitosterol lessens their binding and the presence of both GluCer and sitosterol further reduces their interaction. Hydrophobic effect and polar interactions are involved in the binding. The chemical structure of HPOs influences their affinity for PPM lipids. The presence of three double bonds in the HPO molecule gives rise to a higher affinity comparatively to two double bonds, which can be explained by their differential interaction with the lipid polar headgroups. [less ▲]

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See detailImpact of rice-fish/shrimp co-culture on the NO2 emission and NH3 volatilization in intensive aquaculture ponds
Li, Fengbo; Feng, Jinfei; Zhou, Xiyue et al

in Science of the Total Environment (2019), 655

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See detailL'expert "Colruyt a raison de se montrer prudent"
Jijakli, Haissam ULiege

Article for general public (2018)

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See detailLes actus: Collaboration Interreg- Lancement du projet Smart Aquaponics
Jijakli, Haissam ULiege

Article for general public (2018)

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See detailHow could the herbicidal effects of selected essential oil compounds be related to their membrane activity ?
Lins, Laurence ULiege; Bettaieb, Ines; Dal Maso, Simon ULiege et al

Poster (2018, September 25)

The European legislation on plant protection products (PPP) is about to undergo important changes in the coming years. The chemical PPP destined to be removed from the European market are responsible for ... [more ▼]

The European legislation on plant protection products (PPP) is about to undergo important changes in the coming years. The chemical PPP destined to be removed from the European market are responsible for the appearance of resistance phenomena to plants pests. It is therefore necessary to explore new alternatives, one of them being the search for natural herbicides. Essential oils (EO) could provide a welcome alternative due to their proven activity as PPP. Even if these compounds seem to have a bright future as PPP, their activity is mainly approached through empirical observations. EO are also a complex mix of of different molecules that could act individually or in synergy. Particularly, very little is known when it comes to molecular mechanisms of action and the relations between structure and activity of the active compounds. This study aims to investigate the structure/activity relationships of some EO molecules, among which cinnamaldehyde (CIN) from cinnamon and citronellal and citronellol from lemongrass. Due to their lipophilic properties, EO tend to interact with one or more of the layers found in the outer plant tissues, among which the cell membranes. For cinnalmaldehyde (and other EO compounds), it has been shown that they are able to interact with bacterial phospholipids and induce change in lipid organization (fluidity, packing,..) on model lipid monolayers (Nowotarska et al, 2014). Citronnellol was notably shown to displace cholesterol from its phospholipid complexes (Lange, Y et al, 2009). However, nothing is known about any interaction with lipids specific to plant plasma membrane (PPM). In this study, we analyzed the effects of the above three EO compounds on model PPM by complementary in vitro and in silico biophysical approaches. We showed that the three compounds have differential effects on plant lipids and different herbicidal properties on plantae. While part of the herbicidal activity could be related to membrane perturbation, some clues remain to be elucidated. Future studies at a molecular point of view would help to better decipher the herbicidal action involving the membrane, other outer plant tissues such as the cuticule and/or and a potential effect on EO compounds on proteins or genomic DNA, as it was shown for CIN on E. Coli (He, TF et al, 2018). [less ▲]

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See detailImproving urban metabolism through agriculture: an approach to a qualitative assessment of ecosystem services in Rome
Cartiaux, Nicolas; Mazzocchi, Giampiero; Marino, Davide et al

in VertigO: la Revue Electronique en Sciences de l'Environnement (2018)

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See detailNutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors
Goddek, Simon; Delaide, Boris; Joyce, Alyssa et al

in Aquacultural Engineering (2018), 83

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See detailStudy of Tunisian plant extracts as bioherbicide
Ben Kaab, Sofiène ULiege; Rebey Bettaieb, Ines; Fauconnier, Marie-Laure ULiege et al

Conference (2018, May 22)

Weeds constantly compete with crops for water and nutrient resources reducing yield, quality and consequently causing huge economic losses (Araniti et al., 2015) that can rise up to 34% in major crops ... [more ▼]

Weeds constantly compete with crops for water and nutrient resources reducing yield, quality and consequently causing huge economic losses (Araniti et al., 2015) that can rise up to 34% in major crops (Jabran et al., 2015). Actually, the current trend is to find a biological product to minimize the perceived impacts from synthetic herbicides in agriculture production (Sbai et al., 2016). In this context, the herbicidal activity of ten crude different extracts obtained from aerial parts of Tunisian spontaneous plants was determined on post-emergence at 7.5, 20 and 34 g/L against Trifolium incanatum, sylibum marianum and Phalaris minor. Aerial plant materials were grounded and macerated with methanol for 24H. Methanol was then eliminated using a rotavapor. The yield of plant extracts varied between 5.29% and 29.71 % following the species. Extracts 6, 8, and 3 exhibit the best activity in terms of visual effect by spraying on weeds. Moreover, a formulation was carried out to improve their efficiency. The results showed that formulated E6 has completely punctured Trifolium incanatum and has inhibited growth of Phalaris minor and Sylibum marianum. A fractionation of E6 was then carried out. Five fractions were obtained and tested on Trifolium incanatum. Among these fractions, F2 formulated at 20 g/L showed a very similar effect to a commercial bioherbicide. It caused the total death of Trifolium incanatum 9 days after spraying. Based on bioassay-guided fractionation, five compounds were identified which can be employed in developing new types of bioherbicides for controlling weeds on crops. In addition, the strong weed suppressive ability of formulated F2 therefore offers interesting possibilities as an effective natural environment-friendly approach for weed management. [less ▲]

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See detailIdentification of fungal volatile organic compounds emitted during quorum sensing as potential biocontrol agents
De Clerck, Caroline ULiege; Jallais, Lucie; Vangoethem, Valentine et al

Conference (2018, May 22)

Detailed reference viewed: 39 (10 ULiège)